package com.zqwm.fly.utils;

@SuppressWarnings("all")
public class MD5 {

        static final int S11 = 7;
        static final int S12 = 12;
        static final int S13 = 17;
        static final int S14 = 22;
        static final int S21 = 5;
        static final int S22 = 9;
        static final int S23 = 14;
        static final int S24 = 20;
        static final int S31 = 4;
        static final int S32 = 11;
        static final int S33 = 16;
        static final int S34 = 23;
        static final int S41 = 6;
        static final int S42 = 10;
        static final int S43 = 15;
        static final int S44 = 21;
        static final byte[] PADDING = {-128, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
        private long[] state = new long[4];  // state (ABCD)

        private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)

        private byte[] buffer = new byte[64]; // input buffer

        public String digestHexStr;
        private byte[] digest = new byte[16];

        /** 从Byte获取MD5, 可以指定编码

         *

         * @param inbuf

         * @return

         */
        public String getMD5ofByte(byte[] inbuf) {
            md5Init();
            md5Update(inbuf, inbuf.length);
            md5Final();
            digestHexStr = "";
            for (int i = 0; i < 16; i++) {
                digestHexStr += byteHEX(digest[i]);
            }
            return digestHexStr;

        }

        public String getMD5ofStr(String inbuf) {
            byte[] inbufBt = inbuf.getBytes(); //2012/3/30 lq 修改中文长度计算问题

            md5Init();
            md5Update(inbufBt, inbufBt.length);
            md5Final();
            digestHexStr = "";
            for (int i = 0; i < 16; i++) {
                digestHexStr += byteHEX(digest[i]);
            }
            return digestHexStr;

        }

        public byte[] getMD5ByteofStr(String inbuf) {
            md5Init();
            md5Update(inbuf.getBytes(), inbuf.length());
            md5Final();
//        digestHexStr = "";

//        for (int i = 0; i < 16; i++) {

//            digestHexStr += byteHEX(digest[i]);

//        }

//        return digestHexStr;

            return digest;
        }

        public MD5() {
            md5Init();

            return;
        }

        private void md5Init() {
            count[0] = 0L;
            count[1] = 0L;
            ///* Load magic initialization constants.


            state[0] = 0x67452301L;
            state[1] = 0xefcdab89L;
            state[2] = 0x98badcfeL;
            state[3] = 0x10325476L;

            return;
        }

        private long F(long x, long y, long z) {
            return (x & y) | ((~x) & z);

        }

        private long G(long x, long y, long z) {
            return (x & z) | (y & (~z));

        }

        private long H(long x, long y, long z) {
            return x ^ y ^ z;
        }

        private long I(long x, long y, long z) {
            return y ^ (x | (~z));
        }

        private long FF(long a, long b, long c, long d, long x, long s,
                        long ac) {
            a += F(b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
        }

        private long GG(long a, long b, long c, long d, long x, long s,
                        long ac) {
            a += G(b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
        }

        private long HH(long a, long b, long c, long d, long x, long s,
                        long ac) {
            a += H(b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
        }

        private long II(long a, long b, long c, long d, long x, long s,
                        long ac) {
            a += I(b, c, d) + x + ac;
            a = ((int) a << s) | ((int) a >>> (32 - s));
            a += b;
            return a;
        }

        private void md5Update(byte[] inbuf, int inputLen) {

            int i, index, partLen;
            byte[] block = new byte[64];
            index = (int) (count[0] >>> 3) & 0x3F;
            // /* Update number of bits */

            if ((count[0] += (inputLen << 3)) < (inputLen << 3)) {
                count[1]++;
            }
            count[1] += (inputLen >>> 29);

            partLen = 64 - index;

            // Transform as many times as possible.

            if (inputLen >= partLen) {
                md5Memcpy(buffer, inbuf, index, 0, partLen);
                md5Transform(buffer);

                for (i = partLen; i + 63 < inputLen; i += 64) {

                    md5Memcpy(block, inbuf, 0, i, 64);
                    md5Transform(block);
                }
                index = 0;

            } else {
                i = 0;
            }

            ///* Buffer remaining input */

            md5Memcpy(buffer, inbuf, index, i, inputLen - i);

        }

        private void md5Final() {
            byte[] bits = new byte[8];
            int index, padLen;

            ///* Save number of bits */

            Encode(bits, count, 8);

            ///* Pad out to 56 mod 64.

            index = (int) (count[0] >>> 3) & 0x3f;
            padLen = (index < 56) ? (56 - index) : (120 - index);
            md5Update(PADDING, padLen);

            ///* Append length (before padding) */

            md5Update(bits, 8);

            ///* Store state in digest */

            Encode(digest, state, 16);

        }

        private void md5Memcpy(byte[] output, byte[] input,
                               int outpos, int inpos, int len) {
            int i;

            for (i = 0; i < len; i++) {
                output[outpos + i] = input[inpos + i];
            }
        }

        private void md5Transform(byte block[]) {
            long a = state[0], b = state[1], c = state[2], d = state[3];
            long[] x = new long[16];

            Decode(x, block, 64);

        /* Round 1 */
            a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
            d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
            c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
            b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
            a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
            d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
            c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
            b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
            a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
            d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
            c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
            b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
            a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
            d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
            c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
            b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

        /* Round 2 */
            a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
            d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
            c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
            b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
            a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
            d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
            c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
            b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
            a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
            d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
            c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
            b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
            a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
            d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
            c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
            b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

        /* Round 3 */
            a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
            d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
            c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
            b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
            a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
            d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
            c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
            b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
            a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
            d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
            c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
            b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
            a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
            d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
            c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
            b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

        /* Round 4 */
            a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
            d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
            c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
            b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
            a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
            d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
            c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
            b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
            a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
            d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
            c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
            b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
            a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
            d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
            c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
            b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

            state[0] += a;
            state[1] += b;
            state[2] += c;
            state[3] += d;

        }

        private void Encode(byte[] output, long[] input, int len) {
            int i, j;

            for (i = 0, j = 0; j < len; i++, j += 4) {
                output[j] = (byte) (input[i] & 0xffL);
                output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
                output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
                output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
            }
        }

        private void Decode(long[] output, byte[] input, int len) {
            int i, j;


            for (i = 0, j = 0; j < len; i++, j += 4) {
                output[i] = b2iu(input[j])
                        | (b2iu(input[j + 1]) << 8)
                        | (b2iu(input[j + 2]) << 16)
                        | (b2iu(input[j + 3]) << 24);
            }

            return;
        }

        public static long b2iu(byte b) {
            return b < 0 ? b & 0x7F + 128 : b;
        }

        public static String byteHEX(byte ib) {
            char[] Digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                    'A', 'B', 'C', 'D', 'E', 'F'};
            char[] ob = new char[2];
            ob[0] = Digit[(ib >>> 4) & 0X0F];
            ob[1] = Digit[ib & 0X0F];
            String s = new String(ob);
            return s;
        }

        public static void main(String args[]) {
            String str = "0200 190000 0.3 20140309210429 210429 reference 102020000025 20140309210429" + " " + "123456";
            MD5 m = new MD5();
            String md5Str = m.getMD5ofStr(str);
            System.out.println(md5Str);
        }
    }
